Sökning: "electron holes"

Visar resultat 11 - 15 av 20 uppsatser innehållade orden electron holes.

1. 11. Testprocedur för undersökning av adhesiv förslitning vid svarvning

   M1-uppsats, Högskolan i Gävle/Avdelningen för Industriell utveckling, IT och Samhällsbyggnad

   Författare :Robert Vik; [2018]
   Nyckelord :Adhesiv förslitning;

   Sammanfattning : Adhesive wear in machining is caused by adhering through micro welding of workmaterial on the cutting tool, this may lead to the formation of built-up edge andbuilt-up layer. This is known as secondary adhesion, the wear mechanism mayalso lead to pieces of the tool coating being ripped of and following the chip, which is known as primary adhesion. LÄS MER

3. 12. Spatial control of electron & hole states in InAs/GaSb heterostructures

   Master-uppsats, Lunds universitet/Fasta tillståndets fysik; Lunds universitet/Fysiska institutionen

   Författare :Felix Vennberg; [2018]
   Nyckelord :InAs; GaSb; Nanowires; ambipolar; heterostructures; III-V; Physics and Astronomy;

   Sammanfattning : Single nanowire transistors employing three separately controlled electrostatic gates were fabricated to investigate band gap modulation in InAs-GaSb heterostructures. The aim is to show hybridization between electron and hole states over the heterojunction. LÄS MER

4. 13. Degradation of Microplastic Residuals in Water by Visible Light Photocatalysis

   Master-uppsats, KTH/Hållbar utveckling, miljövetenskap och teknik

   Författare :Tajkia Syeed Tofa; [2018]
   Nyckelord :Microplastics; Low density Polyethylene LDPE ; Heterogeneous photocatalytic degradation; Zinc oxide nanorods; Visible light.;

   Sammanfattning : Microplastic (MP) pollution has recently been recognized as a threat to the biosphere including humans due to its widespread distribution, persistent nature and infinitesimal size. This study focused on the solid phase degradation of microplastic residues (particularly low density polyethylene, LDPE) in water through heterogeneous photocatalysis process by designed photocatalysts of zinc oxide nanorods (ZnO NRs) and platinum nanoparticles deposited on zincoxide nanorods (Pt NPs-ZnO NRs) under visible light irradiation. LÄS MER

5. 14. Development and simulation of an active target detector with GEM foil readout

   Master-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Kärnfysik

   Författare :Elisabeth Rickert; [2017]
   Nyckelord :Physics and Astronomy;

   Sammanfattning : At CERN, radioactive ion beams with energies of up to 10 MeV/u can be pro- duced by a newly commissioned post-accelerator, HIE-ISOLDE, which expands the possibilities for nuclear reaction studies. To investigate the collision properties of the ion beam with a target, an active gas–target detector is under development by the Reactions Group at the Nuclear Physics Division in Lund. LÄS MER

7. 15. On the Properties of a Few Electron-Hole system in a Double One-dimensional Harmonic Trap

   Master-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Matematisk fysik

   Författare :Fan Pan; [2012]
   Nyckelord :Electron-Hole system; Few-body; CI methods; Exciton-like; Double one-dimension; harmonic trap; Physics and Astronomy;

   Sammanfattning : One of the most important concepts in condensed matter physics is that of ``quasi particles''. The exciton is one such quasi particle. In semi-conductors, excitons are formed by the excitation of electrons from valence band to conduction band, which creates holes in the valence band. LÄS MER